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Millions of chickens had already been culled in Thailand before two boys in farming provinces were confirmed to have caught bird flu.

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First the authorities said sick birds in Thailand were affected by cholera not bird flu.

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Now they have issued strict health guidelines saying both chicken and eggs should not be eaten unless well cooked.

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Thai Prime Minister Thaksin Shinawatra has urged Thais not to panic, saying there is no evidence of human-to-human transmission.

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Japan is among countries which have ordered the removal of Thai poultry from its food shops.

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Officials fear major economic consequences as Thailand is Asia's largest poultry exporter.